jjil.algorithm
Class GrayRectStretch

java.lang.Object
  jjil.core.PipelineStage
      jjil.algorithm.GrayRectStretch

public class GrayRectStretch
extends PipelineStage

Pipeline stage stretches an image to a larger rectangular size with bilinear interpolation. For more information on this and other image warps, see George Wolberg's excellent book, "Digital Image Warping", Wiley-IEEE Computer Society Press, 1990.

Author:

webb

Constructor Summary

GrayRectStretch(int cWidth, int cHeight)
Creates a new instance of GrayRectStretch.

Method Summary

int	getHeight() Gets current target height
int	getWidth() Gets current target width
void	push(Image image) Bilinear interpolation to stretch image to (cWidth, cHeight).
void	setHeight(int cHeight) Changes target height
void	setWidth(int cWidth) Changes target width
java.lang.String	toString() Return a string describing the stretching operation.

Methods inherited from class jjil.core.PipelineStage

getFront, isEmpty

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GrayRectStretch

public GrayRectStretch(int cWidth,
                       int cHeight)
                throws Error

Creates a new instance of GrayRectStretch.

Parameters:

cWidth - new image width

cHeight - new image height

Throws:

Error - if either is less than or equal to zero.

Method Detail

getHeight

public int getHeight()

Gets current target height

Returns:

current height

getWidth

public int getWidth()

Gets current target width

Returns:

current width

push

public void push(Image image)
          throws Error

Bilinear interpolation to stretch image to (cWidth, cHeight). Does this in two passes, for more efficient computation.

Specified by:

push in class PipelineStage

Parameters:

image - the input image

Throws:

Error - if input image is not gray 8 bits, or the input image size is larger than the target size. This class does not do subsampling, only interpolation.

setHeight

public void setHeight(int cHeight)
               throws Error

Changes target height

Parameters:

cHeight - the new target height.

Throws:

Error - if height is not positive

setWidth

public void setWidth(int cWidth)
              throws Error

Changes target width

Parameters:

cWidth - the new target width.

Throws:

Error - if height is not positive

toString

public java.lang.String toString()

Return a string describing the stretching operation.

Overrides:

toString in class java.lang.Object

Returns:

the string describing the stretching operation.